01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.cocoon.components.variables;
18:
19: import org.apache.cocoon.sitemap.PatternException;
20:
21: /**
22: * This factory component creates a {@link VariableResolver} for an expression.
23: * A {@link VariableResolver} can then be used at runtime to resolve
24: * a variable with the current value.
25: * A variable can contain dynamic parts that are contained in {...},
26: *
27: * NOTE: This interface is work in progress, so chances are that it will
28: * change.
29: *
30: * @author <a href="mailto:cziegeler@apache.org">Carsten Ziegeler</a>
31: *
32: * @version CVS $Id: VariableResolverFactory.java 433543 2006-08-22 06:22:54Z crossley $
33: */
34: public interface VariableResolverFactory {
35:
36: String ROLE = VariableResolverFactory.class.getName();
37:
38: /**
39: * Get a resolver for a given expression. Chooses the most efficient implementation
40: * depending on <code>expression</code>.
41: * Don't forget to release the resolver
42: */
43: VariableResolver lookup(String expression) throws PatternException;
44:
45: void release(VariableResolver resolver);
46: }
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